The expanded hiking rules in High Tech are mostly a note that Campaigns uses a simplified model and assumes 16 hour daily forced marches.
I worked some significantly more detailed rules for my hexcrawl campaign. They're basically extrapolations of the existing rules, plus some more specifics on visibility and horizon. The rules for foraging are outdated and would need to be replaced by the new systems from AtE: New World or DF16: Wilderness Adventures.
Anyway, you may want to take a look at them:
http://westmarchsaga.wikia.com/wiki/...on_House_Rules